Function probeSchema

src/directory.ts:216–230

* What `codegraph.db` holds, asked of SQLite itself through a read-only * connection: the codegraph schema, a database without it, not a database at * all (SQLITE_NOTADB), or `unknown` — locked, busy, a WAL db in a directory we * cannot create `-shm` in (read-only checkout, mount, another user's

(dbPath: string)

 * second connection opened and closed here leaves the first one's locks alone.
 */
function probeSchema(dbPath: string): 'schema' | 'no-schema' | 'not-sqlite' | 'unknown' {
  // eslint-disable-next-line @typescript-eslint/no-require-imports
  const { DatabaseSync } = require('node:sqlite');
  let db: any = null;
  try {
    db = new DatabaseSync(dbPath, { readOnly: true });
    const row = db.prepare("SELECT 1 AS ok FROM sqlite_master WHERE type = 'table' AND name = 'nodes'").get();
    return row !== undefined ? 'schema' : 'no-schema';
  } catch (error) {
    return (error as { errcode?: number })?.errcode === SQLITE_NOTADB ? 'not-sqlite' : 'unknown';
  } finally {
    // Never hold the handle: Windows file locking would block the owner.
    try { db?.close(); } catch { /* already closed */ }
  }
}

/**
 * Find the nearest parent directory containing .codegraph/